Hi,
A dense fabric without loops is prefered, that way nails do not get caught in the blankets. You could try double knitting. Also, man- made medium to dark color yarns that are hard wearing is recommended by the site (H4H Animals) and some shelters. If you have a particular shelter in mind it might be best to call them to see what they would like and or need. Blocked for design ideas don't forget to turn to a trusty stitch dictionary. HTH.
Katrina

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Judge: Madame, either you will have to cease knitting or I will have to cease judging. Which shall it be?

Miss Marple: It helps me to concentrate, milord.

Judge: It does not help me, madame.

Miss Marple: Oh. Very well. (puts away knitting)

Judge: Thank you, Madame.

The lyf so short, the craft so long to lerne.
~ Geoffrey Chaucer - The Parliament of Fowls Line 1.

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